I haven't looked to be honest. I've somehow managed to maintain the original material in my 72 for now. I'm not yet at the stage on the 70 where I need to look at this. It depends on how "original" you want to go. Some might be ok with other material. I like the original stuff.

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how thick are they? from what i can tell, the difference between this jute material and carpet underlay ( which is what I was going to use) is that it's more conformant to curves, which is why they use for molded carpets